Oilpan: fix build after r356253.

third_party/WebKit/Source/platform/MemoryPurgeController.h

Index: third_party/WebKit/Source/platform/MemoryPurgeController.h
diff --git a/third_party/WebKit/Source/platform/MemoryPurgeController.h b/third_party/WebKit/Source/platform/MemoryPurgeController.h
index d355e63053689c715291702e4d8b1e1c28b05346..6f671af5ab206b9f2f13cb4182131deee87e879c 100644
--- a/third_party/WebKit/Source/platform/MemoryPurgeController.h
+++ b/third_party/WebKit/Source/platform/MemoryPurgeController.h
@@ -42,13 +42,13 @@ public:
 // for reducing memory consumption and notifies its clients.
 // Since we want to control memory per tab, MemoryPurgeController is owned by
 // Page.
-class PLATFORM_EXPORT MemoryPurgeController final : public NoBaseWillBeGarbageCollected<MemoryPurgeController> {
-    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MemoryPurgeController);
+class PLATFORM_EXPORT MemoryPurgeController final : public NoBaseWillBeGarbageCollectedFinalized<MemoryPurgeController> {
 public:
     static PassOwnPtrWillBeRawPtr<MemoryPurgeController> create()
     {
         return adoptPtrWillBeNoop(new MemoryPurgeController);
     }
+    ~MemoryPurgeController();
 
     void registerClient(MemoryPurgeClient* client)
     {